31 Year NEET Previous Year Questions: Laws of Motion - 2

Question 1

Starting from rest, a body slides down a 45° inclined plane in twice the time it takes to slide down the same distance in the absence of friction.The coefficient of friction between the body and the inclined plane is [1988]

Accepted Answer

0.75

Answer

0.80

Answer

0.25

Answer

0.33

Question 2

Two bodies of masses m and 4m are moving with equal kinetic energies. The ratio of their linear momenta will be [1988]

Accepted Answer

1 : 2

Answer

1 : 4

Answer

4 : 1

Answer

2 : 1

Question 3

A body of mass 5 kg explodes at rest into three fragments with masses in the ratio 1 : 1 : 3. The fragments with equal masses fly in mutually perpendicular directions with speeds of 21 m/s.The velocity of heaviest fragment in m/s will be

Accepted Answer

Answer

<img src="https://cn.edurev.in/ApplicationImages/Temp/3066490_2af22c82-c354-42e4-b1ec-01a7e5b4ac80_lg.png" /> [1989]

Answer

Answer

Question 4

A 4 kg mass and 1 kg are moving with equal kinetic energies. The ratio of the magnitudes of their linear momenta is [1989]

Accepted Answer

2 : 1

Answer

1 : 2

Answer

1 : 1

Answer

4 : 1

Question 5

A 600 kg rocket is set for a vertical firing. If the exhaust speed is 1000 ms^–1 , the mass of the gas ejected per second to supply the thrust needed to overcome the weight of rocket is [1990]

Accepted Answer

6 kg s^–1

Answer

117.6 kg s^–1

Answer

58.6 kg s^–1

Answer

76.4 kg s^–1

Question 6

A particle of mass m is moving with a uniform velocity v₁. It is given an impulse such that its velocity becomes v₂. The impulse is equal to [1990]

Accepted Answer

m [v₂ – v₁]

Answer

m[| v₂ | – | v₁|]

Answer

Answer

m[v₁+ v₂]

Question 7

A heavy uniform chain lies on horizontal table top. If the coefficient of friction between the chain and the table surface is 0.25, then the maximum fraction of the length of the chain that can hang over one edge of the table is [1991]

Accepted Answer

20%

Answer

25%

Answer

35%

Answer

15%

Question 8

Physical independence of force is a consequence of[1991]

Accepted Answer

first law of motion

Answer

third law of motion

Answer

second law of motion

Answer

all of these laws

Question 9

Consider a car moving along a straight horizontal road with a speed of 72 km/h. If the coefficient of static friction between the tyres and the road is 0.5, the shortest distance in which the car can be stopped is (taking g = 10 m/s²) [1992]

Accepted Answer

40 m

Answer

30 m

Answer

72 m

Answer

20 m

Question 10

A particle of mass M is moving in a horizontal circle of radius R with uniform speed V. When it moves from one point to a diametrically opposite point, its [1992]

Accepted Answer

momentum changes by 2 MV

Answer

kinetic energy changes by MV²/4

Answer

momentum does not change

Answer

kinetic energy changes by MV²

Question 11

A monkey is decending from the branch of a tree with constant acceleration. If the breaking strength is 75% of the weight of the monkey, the minimum acceleration with which monkey can slide down without breaking the branch is [1993]

Accepted Answer

Answer

g

Answer

Answer

Question 12

A block has been placed on an inclined plane with the slope angle θ, block slides down the plane at constant speed. The coefficient of kinetic friction is equal to [1993]

Accepted Answer

tan&theta;

Answer

sin&theta;

Answer

cos&theta;

Answer

g

Question 13

A shell is fired from a cannon, it explodes in mid air, its total [1994]

Accepted Answer

K.E. increases

Answer

momentum increases

Answer

momentum decreases

Answer

K.E. decreases

Question 14

A satellite in a force free space sweeps stationary interplanetary dust at a rate (dM/dt) = αv. The acceleration of satellite is [1994]

Accepted Answer

Answer

Answer

Answer

Question 15

If the force on a rocket moving with a velocity of 300 m/sec is 345 N, then the rate of combustion of the fuel, is [1995]

Accepted Answer

1.15 kg/sec

Answer

0.55 kg/sec

Answer

0.75 kg/sec

Answer

2.25 kg/sec

Question 16

What will be the maximum speed of a car on a road turn of radius 30 m if the coefficient of friction between the tyres and the road is 0.4 (Take g = 9.8 m/s2) [1995]

Accepted Answer

10.84 m/s

Answer

9.84 m/s

Answer

8.84 m/s

Answer

6.84 m/s

Question 17

A 10 N force is applied on a body produces an acceleration of 1 m/s². The mass of the body is [1996]

Accepted Answer

10 kg

Answer

5 kg

Answer

15 kg

Answer

20 kg

Question 18

A ball of mass 150 g, moving with an acceleration 20 m/s², is hit by a force, which acts on it for 0.1 sec. The impulsive force is [1996]

Accepted Answer

0.3 N

Answer

0.5 N

Answer

0.1 N

Answer

1.2 N

Question 19

A mass of 1 kg is suspended by a thread. It is (i) lifted up with an acceleration 4.9 m/s², (ii) lowered with an acceleration 4.9 m/s2.The ratio of the tensions is [1998]

Accepted Answer

3 : 1

Answer

1 : 2

Answer

1 : 3

Answer

2 : 1

Question 20

A bullet is fired from a gun. The force on the bullet is given by F = 600 – 2 × 10⁵t where, F is in newton and t in second. The force on the bullet becomes zero as soon as it leaves the barrel.What is the average impulse imparted to the bullet?[1998]

Accepted Answer

0.9 N-s

Answer

1.8 N-s

Answer

zero

Answer

9 N-s

Question 21

A 5000 kg rocket is set for vertical firing. The exhaust speed is 800 ms^–1. To give an initial upward acceleration of 20 ms^–2, the amount of gas ejected per second to supply the needed thrust will be (g = 10 ms^–2) [1998]

Accepted Answer

187.5 kg s^–1

Answer

127.5 kg s^–1

Answer

185.5 kg s^–1

Answer

137.5 kg s^–1

Question 22

Two blocks m₁ = 5 gm and m₂ = 10 gm are hung vertically over a light frictionless pulley as shown here. What is the acceleration of the masses when they are left free? [2000] (where g is acceleration due to gravity)

Accepted Answer

g/3

Answer

g/2

Answer

g

Answer

g/5

Question 23

A person slides freely down a frictionless inclined plane while his bag falls down vertically from the same height. The final speeds of the man (V_M) and the bag (V_B) should be such that [2000]

Accepted Answer

VM = VB

Answer

VM < VB

Answer

they depend on the masses

Answer

VM > VB

Question 24

A block of mass 1 kg lies on a horizontal surface in a truck the coefficient of static friction between the block and the surface is 0.6. If the acceleration of the truck is 5 m/s², the frictional force acting on the block is

Accepted Answer

5 N

Answer

5.88 N

Answer

6 N

Answer

4.6 N

Question 25

If a cricketer catches a ball of mass 150 gm moving with a velocity of 20 m/s, then he experiences a force of (Time taken to complete the catch is 0.1 sec.)[2001]

Accepted Answer

30 N

Answer

300 N

Answer

3 N

Answer

0.3 N

Question 26

A lift weighing 1000 kg is moving upwards with an accelertion of 1 m/s². The tension in the supporting cable is [2002]

Accepted Answer

10800N

Answer

980N

Answer

9800N

Answer

8800N

Question 27

A 100 N force acts horizontally on a block of 10 kg placed on a horizontal rough surface of coefficient of friction μ = 0.5. If the acceleration due to gravity (g) is taken as 10 ms^–2, the acceleration of the block (in ms^–2) is [2002]

Accepted Answer

5

Answer

2.5

Answer

10

Answer

7.5

Question 28

A man weighing 80 kg, stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of 5m/s². What would be the reading on the scale ? (g = 10 m/s²) [2003]

Accepted Answer

1200 N

Answer

zero

Answer

400 N

Answer

800 N

Question 29

A monkey of mass 20 kg is holding a vertical rope. The rope will not break when a mass of 25 kg is suspended from it but will break if the mass exceeds 25 kg. What is the maximum acceleration with which the monkey can climb up along the rope ? (g = 10 m/s²) [2003]

Accepted Answer

2.5 m/s2

Answer

5 m/s2

Answer

10 m/s2

Answer

25 m/s2

Question 30

The coeffici ent of static friction , μ_s, between block A of mass 2 kg and the table as shown in the figure is 0.2. What would be the maximum mass value of block B so that the two blocks do not move? The string and the pulley are assumed to be smooth and massless. (g = 10 m/s²) [2004]

Accepted Answer

0.4 kg

Answer

2.0 kg

Answer

4.0 kg

Answer

0.2 kg

31 Year NEET Previous Questions: Laws of Motion - 2 Free MCQ Practice Test

MCQ Practice Test & Solutions: 31 Year NEET Previous Year Questions: Laws of Motion - 2 (30 Questions)

Starting from rest, a body slides down a 45° inclined plane in twice the time it takes to slide down the same distance in the absence of friction.The coefficient of friction between the body and the inclined plane is [1988]

Two bodies of masses m and 4m are moving with equal kinetic energies. The ratio of their linear momenta will be [1988]

A body of mass 5 kg explodes at rest into three fragments with masses in the ratio 1 : 1 : 3. The fragments with equal masses fly in mutually perpendicular directions with speeds of 21 m/s.The velocity of heaviest fragment in m/s will be

A 4 kg mass and 1 kg are moving with equal kinetic energies. The ratio of the magnitudes of their linear momenta is [1989]

A 600 kg rocket is set for a vertical firing. If the exhaust speed is 1000 ms–1 , the mass of the gas ejected per second to supply the thrust needed to overcome the weight of rocket is [1990]

A particle of mass m is moving with a uniform velocity v1. It is given an impulse such that its velocity becomes v2. The impulse is equal to [1990]

A heavy uniform chain lies on horizontal table top. If the coefficient of friction between the chain and the table surface is 0.25, then the maximum fraction of the length of the chain that can hang over one edge of the table is [1991]

Physical independence of force is a consequence of[1991]

Consider a car moving along a straight horizontal road with a speed of 72 km/h. If the coefficient of static friction between the tyres and the road is 0.5, the shortest distance in which the car can be stopped is (taking g = 10 m/s2) [1992]

A particle of mass M is moving in a horizontal circle of radius R with uniform speed V. When it moves from one point to a diametrically opposite point, its [1992]

A monkey is decending from the branch of a tree with constant acceleration. If the breaking strength is 75% of the weight of the monkey, the minimum acceleration with which monkey can slide down without breaking the branch is [1993]

A block has been placed on an inclined plane with the slope angle θ, block slides down the plane at constant speed. The coefficient of kinetic friction is equal to [1993]

A shell is fired from a cannon, it explodes in mid air, its total [1994]

A satellite in a force free space sweeps stationary interplanetary dust at a rate (dM/dt) = αv. The acceleration of satellite is [1994]

If the force on a rocket moving with a velocity of 300 m/sec is 345 N, then the rate of combustion of the fuel, is [1995]

What will be the maximum speed of a car on a road turn of radius 30 m if the coefficient of friction between the tyres and the road is 0.4 (Take g = 9.8 m/s2) [1995]

A 10 N force is applied on a body produces an acceleration of 1 m/s2. The mass of the body is [1996]

A ball of mass 150 g, moving with an acceleration 20 m/s2, is hit by a force, which acts on it for 0.1 sec. The impulsive force is [1996]

A mass of 1 kg is suspended by a thread. It is (i) lifted up with an acceleration 4.9 m/s2, (ii) lowered with an acceleration 4.9 m/s2.The ratio of the tensions is [1998]

A bullet is fired from a gun. The force on the bullet is given by F = 600 – 2 × 105 t where, F is in newton and t in second. The force on the bullet becomes zero as soon as it leaves the barrel.What is the average impulse imparted to the bullet?[1998]

A 5000 kg rocket is set for vertical firing. The exhaust speed is 800 ms–1. To give an initial upward acceleration of 20 ms–2, the amount of gas ejected per second to supply the needed thrust will be (g = 10 ms–2) [1998]

Two blocks m1 = 5 gm and m2 = 10 gm are hung vertically over a light frictionless pulley as shown here. What is the acceleration of the masses when they are left free? [2000] (where g is acceleration due to gravity)

A person slides freely down a frictionless inclined plane while his bag falls down vertically from the same height. The final speeds of the man (VM) and the bag (VB) should be such that [2000]

A block of mass 1 kg lies on a horizontal surface in a truck the coefficient of static friction between the block and the surface is 0.6. If the acceleration of the truck is 5 m/s2, the frictional force acting on the block is

If a cricketer catches a ball of mass 150 gm moving with a velocity of 20 m/s, then he experiences a force of (Time taken to complete the catch is 0.1 sec.)[2001]

A lift weighing 1000 kg is moving upwards with an accelertion of 1 m/s2. The tension in the supporting cable is [2002]

A 100 N force acts horizontally on a block of 10 kg placed on a horizontal rough surface of coefficient of friction μ = 0.5. If the acceleration due to gravity (g) is taken as 10 ms–2, the acceleration of the block (in ms–2) is [2002]

A man weighing 80 kg, stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of 5m/s2. What would be the reading on the scale ? (g = 10 m/s2) [2003]

A monkey of mass 20 kg is holding a vertical rope. The rope will not break when a mass of 25 kg is suspended from it but will break if the mass exceeds 25 kg. What is the maximum acceleration with which the monkey can climb up along the rope ? (g = 10 m/s2) [2003]

The coeffici ent of static friction , μs, between block A of mass 2 kg and the table as shown in the figure is 0.2. What would be the maximum mass value of block B so that the two blocks do not move? The string and the pulley are assumed to be smooth and massless. (g = 10 m/s2) [2004]

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A 600 kg rocket is set for a vertical firing. If the exhaust speed is 1000 ms^–1 , the mass of the gas ejected per second to supply the thrust needed to overcome the weight of rocket is [1990]

A particle of mass m is moving with a uniform velocity v₁. It is given an impulse such that its velocity becomes v₂. The impulse is equal to [1990]

Consider a car moving along a straight horizontal road with a speed of 72 km/h. If the coefficient of static friction between the tyres and the road is 0.5, the shortest distance in which the car can be stopped is (taking g = 10 m/s²) [1992]

A 10 N force is applied on a body produces an acceleration of 1 m/s². The mass of the body is [1996]

A ball of mass 150 g, moving with an acceleration 20 m/s², is hit by a force, which acts on it for 0.1 sec. The impulsive force is [1996]

A mass of 1 kg is suspended by a thread. It is (i) lifted up with an acceleration 4.9 m/s², (ii) lowered with an acceleration 4.9 m/s2.The ratio of the tensions is [1998]

A bullet is fired from a gun. The force on the bullet is given by F = 600 – 2 × 10⁵t where, F is in newton and t in second. The force on the bullet becomes zero as soon as it leaves the barrel.What is the average impulse imparted to the bullet?[1998]

A 5000 kg rocket is set for vertical firing. The exhaust speed is 800 ms^–1. To give an initial upward acceleration of 20 ms^–2, the amount of gas ejected per second to supply the needed thrust will be (g = 10 ms^–2) [1998]

Two blocks m₁ = 5 gm and m₂ = 10 gm are hung vertically over a light frictionless pulley as shown here. What is the acceleration of the masses when they are left free? [2000] (where g is acceleration due to gravity)

A person slides freely down a frictionless inclined plane while his bag falls down vertically from the same height. The final speeds of the man (V_M) and the bag (V_B) should be such that [2000]

A block of mass 1 kg lies on a horizontal surface in a truck the coefficient of static friction between the block and the surface is 0.6. If the acceleration of the truck is 5 m/s², the frictional force acting on the block is

A lift weighing 1000 kg is moving upwards with an accelertion of 1 m/s². The tension in the supporting cable is [2002]

A 100 N force acts horizontally on a block of 10 kg placed on a horizontal rough surface of coefficient of friction μ = 0.5. If the acceleration due to gravity (g) is taken as 10 ms^–2, the acceleration of the block (in ms^–2) is [2002]

A man weighing 80 kg, stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of 5m/s². What would be the reading on the scale ? (g = 10 m/s²) [2003]

A monkey of mass 20 kg is holding a vertical rope. The rope will not break when a mass of 25 kg is suspended from it but will break if the mass exceeds 25 kg. What is the maximum acceleration with which the monkey can climb up along the rope ? (g = 10 m/s²) [2003]

The coeffici ent of static friction , μ_s, between block A of mass 2 kg and the table as shown in the figure is 0.2. What would be the maximum mass value of block B so that the two blocks do not move? The string and the pulley are assumed to be smooth and massless. (g = 10 m/s²) [2004]